The cockroach of genus $Blatta$ is also called:

Explain: Cockroach is harmful for human beings.

Cockroach belongs to the class

On an average,female $Periplaneta$ produces $.......$ oothecae,each containing $......$ eggs. Choose the correct option which fills the blanks respectively.

How many times does molting occur from the hatching of an egg until the development of a fully mature adult cockroach?

The structural unit of the eye in a cockroach is called .....